单项选择题

A．Its skeleton.
B．Its shape.
C．Its senses.
D．Its body temperature.

A.Its
B.
B．Its
C.
C．Its
D.
D．Its
E.
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单项选择题
A．A comparison of fish as a cold-blooded animal with warm-blooded animals.B．The difference between water animals and land animals.C．The importance of fish to human beings.D．How water has affected the development of fish.
A.A
B.
B．The
C.
C．The
D.
D．How
E.
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